What is a global warming potential value (GWP)?

Have you seen this reference around in any reading? Global warming potential (GWP) is a measure of the relative global warming effects of different gases. GWP assigns a value to the amount of heat trapped by a certain mass of a gas relative to the amount of heat trapped by a similar mass of carbon dioxide (CO2) over a specific period of time. Carbon dioxide was chosen by the Intergovernmental Panel on Climate Change (IPCC) as the reference gas and its GWP is taken as 1.⁠

Therefore, in terms of a GWP value, CO2 = 1 and HFCS (Hydrofluorocarbons) have a GWP value of 2 to 14,000 for example. ⁠

Source: UNEP